React Apollo Client: Pagination and fetch data on button click - reactjs

Question

I am new to Apollo Client and want to implement pagination. My code looks like this:
I am using RickandMorty endpoint for this (https://rickandmortyapi.com/graphql)
useCharacters.tsx
import { useQuery, gql } from '#apollo/client';
const GET_ALL_CHARACTERS = gql`
query GetCharacters($page: Int) {
characters(page: $page) {
info {
count
pages
}
results {
id
name
}
}
}
`;
export const useCharacters = (page: number = 1) => {
const { data, loading, error } = useQuery(GET_ALL_CHARACTERS, { variables: { page } });
return { data, loading, error };
};
App.tsx
export const App = () => {
const { data, loading, error } = useCharacters(1);
const nextPage = () => {
const { data, loading, error } = useCharacters(2);
};
return (
<>
{loading ? (
<div> Loading... </div>
) : error ? (
<div>Error</div>
) : (
<>
<CharacterList data={data.characters.results} />
<div onClick={nextPage}> Next </div>
</>
);
};
It is fetching data properly the first time but I want to fetch new data when Next button is clicked on page 2.
I know I can't call useQuery() in a method like this as hooks cannot be called inside a block and also the data, error, and loading won't be accessible outside.
How can I fix this issue? I tried googling it but could not find any help related to this.

Answer 1

This might help other developers who are new to Apollo Client and will save them time.
fetchMore() can be used for pagination with Apollo Client.
useCharacters.tsx
export const useCharacters = (page: number = 1, name: string = '') => {
const { data, loading, error, fetchMore } = useQuery(GET_ALL_CHARACTERS, {
variables: { page, name },
notifyOnNetworkStatusChange: true, // to show loader
});
return { data, loading, error, fetchMore }; // returning fetchMore
};
App.tsx
export const App = () => {
const { data, loading, error, fetchMore } = useCharacters(1);
const nextPage = () => {
/* You can call the returned fetchMore() here and pass the next page number.
updateQuery() simply updates your data to the newly fetched records otherwise return previous records
*/
fetchMore({
variables: {
page: 2,
},
updateQuery: (prev, { fetchMoreResult }) => {
if (!fetchMoreResult) return prev;
return fetchMoreResult;
},
});
};
return (
<>
{loading ? (
<div> Loading... </div>
) : error ? (
<div>Error</div>
) : (
<>
<CharacterList data={data.characters.results} />
<div onClick={nextPage}> Next </div>
</>
);
};